These TRE-hM3Dq transgenic mice may be bred to generate Tet-Off/Tet-On mutant mice with conditional (inducible/reversible) expression of hM3Dq; a mutant G protein-coupled receptor (GPCR) that activates the canonical Gq pathway specifically following administration of the pharmacologically inert molecule clozapine-N-oxide (CNO). TRE-hM3Dq transgenic mice may be useful for chemogenetic/pharmacogenetic applications to study receptor-specific functions or general downstream cellular signaling emanating from the activated GPCR.
Bryan L Roth, University of North Carolina at Chapel Hill
Hemizygous TRE-hM3Dq transgenic mice are viable and fertile, with no reported phenotypic abnormalities. The TRE-hM3Dq transgene has a modified Tet response element (TRE or tetO) upstream of the mutant G protein-coupled receptor, hM3Dq (a human muscarinic 3 receptor with two amino acid substitutions (Y149C3.33/A239G5.46) that abolish receptor affinity for the native ligand, acetylcholine (ACh), but allow receptor binding and subsequent activation by the small pharmacologically inert molecule clozapine-N-oxide (CNO)). When bred with another mouse expressing tetracycline-controlled transactivator protein (tTA) or reverse tetracycline-controlled transactivator protein (rtTA), hM3Dq expression in the resulting double mutant offspring can be regulated with tetracycline or its analog doxycycline (dox). As designed, TRE-hM3Dq transgenic mice have no reported levels of hM3Dq activity in tTA(+dox) or rtTA(-dox) cell types. In TRE-hM3Dq transgenic tTA(-dox) or TRE-hM3Dq transgenic rtTA(+dox) cells types, hM3Dq expression results in activation of the canonical Gq pathway only following administration of CNO.
These TRE-hM3Dq transgenic mice may be useful to study receptor-specific functions or general downstream cellular signaling emanating from the activated G protein-coupled receptor (GPCR). For example, when bred to a strain expressing tTA in forebrain neurons (Camk2a-tTA; see Stock No. 003010), these transgenic mice are a model allowing in vivo chemical control of neuronal activity, neuronal firing, and non-neuronal signaling.
In addition, breeding TRE-hM3Dq mice with cfos-htTA mice (Stock No. 018306) generates double transgenic offspring with hM3Dq expression in excitatory neurons that are sufficiently active to drive the c-fos promoter. Those hM3Dqfos double transgenic mice allow CNO ligand-induced, artificial reactivation of neurons associated with a specific memory. Temporal modulation may also be employed using dox. Such hM3Dqfos double transgenic mice allow one to generate and artificially-activate a synthetic memory trace, and may be useful in studying the spatial pattern of activity at the time of learning and retrieval.
Of note, several chemogenetic/pharmacogenetic tool strains are available from The Jackson Laboratory Repository; including these Tet-responsive TRE-hM3Dq transgenic mice (Stock No. 014093),
the adora2A-rM3Ds transgenic mice (Stock No. 017863),
the Tet-responsive TRE-hM4Di transgenic mice (Stock No. 024114),
the Cre-inducible R26-LSL-Gi-DREADD mice (R26-hM4Di/mCitrine; Stock No. 026219)
and the Cre-inducible CAG-LSL-Gq-DREADD mice (Tg-hM3Dq/mCitrine [formerly R26-LSL-Gq-DREADD]; Stock No. 026220).
For CNO protocol, see the detailed protocol for dissolving CNO obtained from the attachments section of the Designer Receptors Exclusively Activated by Designer Drugs DREADD wiki webpage.
The TRE-HA-hM3Dq transgene was designed with a modified Tet response element (TRE or (tetO); described in detail below), a hemagglutinin epitope tag (HA), the hM3Dq sequence, and an SV40 polyA signal. The hM3Dq sequence is a Gq-coupled human M3 muscarinic DREADD (designer receptor exclusively activated by designer drug). To create the hM3Dq sequence, the wildtype human muscarinic 3 receptor (CHRM3) sequence was modified via site-directed mutagenesis to harbor two amino acid substitutions (Y149C3.33/A239G5.46) that abolish receptor affinity for the native ligand, acetylcholine (ACh), but allow receptor binding and subsequent activation by the small drug-like molecule clozapine-N-oxide (CNO).
This 2.36 kb TRE-HA-hM3Dq transgene was injected into the pronuclei of B6SJL hybrid mouse oocytes. Founder TRE-hM3Dq mice (line 1) were bred with B6;CBA-Tg(Camk2a-tTA)1Mmay/J (see Stock No. 003010) to establish the colony. TRE-hM3Dq transgenic mice were bred together or to wildtype (noncarrier) mice from the colony for approximately eight generations, and then crossed with C57BL/6J mice for one or two generations. The Camk2a-tTA transgene was removed during these breedings. Upon arrival at The Jackson Laboratory Repository, TRE-hM3Dq transgenic mice were bred to C57BL/6J inbred mice (Stock No. 000664) for at least one generation to establish the colony.
Additional information on hM3Dq:
More information on hM3Dq or other DREADDs may be available at the University of North Carolina Designer Receptors Exclusively Activated by Designer Drugs DREADD wiki webpage.
Additional information on TRE promoter:
The TRE promoter used in these transgenic mice is the Tet-responsive Ptight promoter. This Ptight promoter contains a modified Tet response element (TREmod), which consists of seven direct repeats of a 36-bp sequence each containing the 19-bp tet operator sequence (tetO). The TREmod is just upstream of a minimal human cytomegalovirus (CMV) promoter (PminCMVΔ), which lacks the enhancer that is part of the complete CMV promoter. Consequently, Ptight is silent in the absence of binding of TetR or rTetR to the tetO sequences.
|Expressed Gene||CHRM3, cholinergic receptor muscarinic 3, human|
|Site of Expression|
|Allele Name||transgene insertion 1, Bryan Roth|
|Allele Type||Transgenic (Inducible, Inserted expressed sequence)|
|Allele Synonym(s)||Tg(tetO-CHRM3*)1Blr; transgene insertion 1, Bryan Roth|
|Gene Symbol and Name||Tg(tetO-CHRM3*)1Blr, transgene insertion 1, Bryan Roth|
|Promoter||CMV, cytomegalovirus, human|
|Promoter||tetO, tet operator,|
|Expressed Gene||CHRM3, cholinergic receptor muscarinic 3, human|
|Strain of Origin||(C57BL/6 x SJL)F1|
|Molecular Note||The Tet-responsive P promoter which consists of seven direct repeats of 36-bp sequence each containing the 19-bp tet operator sequence (tetO) is just upstream of a minimal human cytomegalovirus (CMV) promoter. This is upstream of a hemagglutinin epitop tag and a Gq-coupled human M3 muscarinic receptor. The wildtype human muscarinic 3 receptor sequence was modified via site-directed mutagenesis to harbor two amino acid substitutions (Y149C and A239G) that abolish receptor affinity for the native ligand, acetylcholine (ACh), but allow receptor binding and subsequent activation by the small drug-like molecule clozapine-N-oxide (CNO).|
|Mutations Made By|| |
Bryan Roth, University of North Carolina at Chapel Hill
When maintaining a live colony, transgene carrier mice may be bred together or to wildtype (noncarrier) mice from the colony. The donating investigator reports they have not tried to generate homozygous mice (November 2011).
When using the TRE-hM3Dq mouse strain in a publication, please cite the originating article(s) and include JAX stock #014093 in your Materials and Methods section.
|Hemizygous or Non carrier for Tg(tetO-CHRM3*)1Blr|
We will fulfill your order by providing at least two carriers for each strain ordered. The total number, sex, and genotypes provided will vary, although typically 8 or more animals are provided. Please check genotypes which will be recovered. While the genotypes of all animals produced will be communicated to you prior to scheduling shipment, the genotypes of animals provided may not reflect the mating scheme and genotypes described in the strain description. Animals are typically ready to ship in 11-14 weeks. If a second recovery is required to produce the minimum number of animals, then delivery time would increase to approximately 25 weeks. If we fail to produce animals of the correct genotype, you will not be charged. We cannot guarantee the reproductive success of mice shipped to your facility. If the mice are lost after the first three days (post-arrival) or do not produce progeny at your facility, a new order and fee will be necessary.
Cryorecovery to establish a Dedicated Supply for greater quantities of mice. Mice recovered can be used to establish a dedicated colony to contractually supply you mice according to your requirements. Price by quotation.
|Frozen Mouse Embryo||$2,595.00 per straw or vial|
"MICE" means mouse strains, their progeny derived by inbreeding or crossbreeding, unmodified derivatives from mouse strains or their progeny supplied by The Jackson Laboratory ("JACKSON"). "PRODUCT(S)" means biological materials supplied by JACKSON, and their derivatives. "SERVICES" means projects conducted by JACKSON for other parties that may include but are not limited to the use of MICE or PRODUCTS. "RECIPIENT" means each recipient of MICE, PRODUCTS, or SERVICES provided by JACKSON including each institution, its employees and other researchers under its control. MICE or PRODUCTS shall not be: (i) used for any purpose other than internal research, (ii) sold or otherwise provided to any third party for any use, or (iii) provided to any agent or other third party to provide breeding or other services. Acceptance of MICE, PRODUCTS or SERVICES from JACKSON shall be deemed as agreement by RECIPIENT to these conditions, and departure from these conditions requires JACKSON’s prior written authorization.
MICE, PRODUCTS AND SERVICES ARE PROVIDED "AS IS". JACKSON EXTENDS NO WARRANTIES OF ANY KIND, EITHER EXPRESS, IMPLIED, OR STATUTORY, WITH RESPECT TO MICE, PRODUCTS OR SERVICES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR ANY WARRANTY OF NON-INFRINGEMENT OF ANY PATENT, TRADEMARK, OR OTHER INTELLECTUAL PROPERTY RIGHTS.
In case of dissatisfaction for a valid reason and claimed in writing by a purchaser within ninety (90) days of receipt of, PRODUCTS or SERVICES, JACKSON will, at its option, provide credit or replacement for the PRODUCT received or the SERVICES provided; JACKSON makes no other representations and this shall be the exclusive remedy of the purchaser. Please note specific policy for live mice.
Consistent with the requirement for a written understanding regarding animal care and use, the JACKSON Animal Care and Use Committee will review the animal care and use protocol(s) associated with any SERVICES to be performed at JACKSON, and JACKSON shall have ultimate responsibility and authority for the care of animals while on site or in JACKSON custody.
In no event shall JACKSON, its trustees, directors, officers, employees, and affiliates be liable for any causes of action or damages, including any direct, indirect, special, or consequential damages, arising out of the provision of MICE, PRODUCTS, or SERVICES, including economic damage or injury to property and lost profits, and including any damage arising from acts or negligence on the part of JACKSON, its agents or employees. Unless prohibited by law, in purchasing or receiving MICE, PRODUCTS, or SERVICES from JACKSON, purchaser or recipient, or any party claiming by or through them, expressly releases and discharges JACKSON from all such causes of action or damages, and further agrees to defend and indemnify JACKSON from any costs or damages arising out of any third party claims.
MICE, PRODUCTS or SERVICES are to be used in a safe manner and in accordance with all applicable governmental rules and regulations.
The foregoing represents the General Terms and Conditions applicable to JACKSON’s MICE, PRODUCTS or SERVICES. In addition, special terms and conditions of sale of certain MICE, PRODUCTS, or SERVICES may be set forth separately in JACKSON web pages, catalogs, price lists, contracts, and/or other documents, and these special terms and conditions shall also govern the sale of these MICE, PRODUCTS and SERVICES by JACKSON, and by its licensees and distributors.
Acceptance of delivery of MICE, PRODUCTS or SERVICES shall be deemed agreement to these terms and conditions. No purchase order or other document transmitted by purchaser or recipient that may modify the terms and conditions hereof, shall be in any way binding on JACKSON, and instead the terms and conditions set forth herein, including any special terms and conditions set forth separately, shall govern the sale of MICE, PRODUCTS or SERVICES by JACKSON.